William Ramsay

Sir William Ramsay KCB (2 October 1852 – 23 July 1916) was a Scottish chemist who discovered the noble gases and received the Nobel Prize in Chemistry in 1904 "in recognition of his services in the discovery of the inert gaseous elements in air".

Quotes

 * But I am leaving the regions of fact, which are difficult to penetrate, but which bring in their train rich rewards, and entering the regions of speculation, where many roads lie open, but where a few lead to a definite goal.
 * Speculating on the nature of radioactive emanations, in his Nobel lecture, December 12, 1904.